From 0550d228335571220705c5dfbecb44595232058a Mon Sep 17 00:00:00 2001
From: Arisotura <thetotalworm@gmail.com>
Date: Thu, 21 Feb 2019 03:44:22 +0100
Subject: [PATCH] hook LAN shito. open proper pcap device. etc

---
 src/libui_sdl/LAN.cpp      | 79 ++++++++++++++++++++++++++++++++------
 src/libui_sdl/LAN.h        |  3 ++
 src/libui_sdl/Platform.cpp | 45 +++-------------------
 3 files changed, 75 insertions(+), 52 deletions(-)

diff --git a/src/libui_sdl/LAN.cpp b/src/libui_sdl/LAN.cpp
index 2021b3d4..da352df9 100644
--- a/src/libui_sdl/LAN.cpp
+++ b/src/libui_sdl/LAN.cpp
@@ -24,6 +24,7 @@
 #include <SDL2/SDL.h>
 #include <pcap/pcap.h>
 #include "LAN.h"
+#include "../Config.h"
 
 #ifdef __WIN32__
 	#include <iphlpapi.h>
@@ -243,23 +244,28 @@ bool Init()
 
 #endif // __WIN32__
 
-    printf("devices: %d\n", NumAdapters);
+    // open pcap device
+    dev = (pcap_if_t*)Adapters[0].Internal;
     for (int i = 0; i < NumAdapters; i++)
     {
-        AdapterData* zog = &Adapters[i];
+        if (!strncmp(Adapters[i].DeviceName, Config::LANDevice, 128))
+            dev = (pcap_if_t*)Adapters[i].Internal;
+    }
 
-        printf("%s:\n", ((pcap_if_t*)zog->Internal)->name);
+    PCapAdapter = pcap_open_live(dev->name, 2048, PCAP_OPENFLAG_PROMISCUOUS, 1, errbuf);
+    if (!PCapAdapter)
+    {
+        printf("PCap: failed to open adapter\n");
+        return false;
+    }
 
-        printf("* %s\n", zog->FriendlyName);
-        printf("* %s\n", zog->Description);
+    pcap_freealldevs(alldevs);
 
-        printf("* "); for (int j = 0; j < 6; j++) printf("%02X:", zog->MAC[j]); printf("\n");
-        printf("* "); for (int j = 0; j < 4; j++) printf("%d.", zog->IP_v4[j]); printf("\n");
-
-        for (int k = 0; k < 8; k++)
-        {
-             printf("* "); for (int j = 0; j < 4; j++) printf("%d.", zog->DNS[k][j]); printf("\n");
-        }
+    if (pcap_setnonblock(PCapAdapter, 1, errbuf) < 0)
+    {
+        printf("PCap: failed to set nonblocking mode\n");
+        pcap_close(PCapAdapter); PCapAdapter = NULL;
+        return false;
     }
 
     return true;
@@ -280,4 +286,53 @@ void DeInit()
     }
 }
 
+void RXCallback(u_char* blarg, const struct pcap_pkthdr* header, const u_char* data)
+{
+    while (PCapRXNum > 0);
+
+    if (header->len > 2048-64) return;
+
+    PCapPacketLen = header->len;
+    memcpy(PCapPacketBuffer, data, PCapPacketLen);
+    PCapRXNum = 1;
+}
+
+int SendPacket(u8* data, int len)
+{
+    if (PCapAdapter == NULL)
+        return 0;
+
+    if (len > 2048)
+    {
+        printf("LAN_SendPacket: error: packet too long (%d)\n", len);
+        return 0;
+    }
+
+    if (!Config::DirectLAN)
+    {
+        // TODO!
+    }
+
+    pcap_sendpacket(PCapAdapter, data, len);
+    // TODO: check success
+    return len;
+}
+
+int RecvPacket(u8* data)
+{
+    if (PCapAdapter == NULL)
+        return 0;
+
+    int ret = 0;
+    if (PCapRXNum > 0)
+    {
+        memcpy(data, PCapPacketBuffer, PCapPacketLen);
+        ret = PCapPacketLen;
+        PCapRXNum = 0;
+    }
+
+    pcap_dispatch(PCapAdapter, 1, RXCallback, NULL);
+    return ret;
+}
+
 }
diff --git a/src/libui_sdl/LAN.h b/src/libui_sdl/LAN.h
index 47e59c91..8021b312 100644
--- a/src/libui_sdl/LAN.h
+++ b/src/libui_sdl/LAN.h
@@ -45,6 +45,9 @@ extern int NumAdapters;
 bool Init();
 void DeInit();
 
+int SendPacket(u8* data, int len);
+int RecvPacket(u8* data);
+
 }
 
 #endif // LAN_H
diff --git a/src/libui_sdl/Platform.cpp b/src/libui_sdl/Platform.cpp
index 4400357c..5cbb1425 100644
--- a/src/libui_sdl/Platform.cpp
+++ b/src/libui_sdl/Platform.cpp
@@ -22,6 +22,7 @@
 #include <SDL2/SDL.h>
 #include "../Platform.h"
 #include "../Config.h"
+#include "LAN.h"
 
 #ifdef __WIN32__
 	#include <winsock2.h>
@@ -260,59 +261,23 @@ int MP_RecvPacket(u8* data, bool block)
 
 bool LAN_Init()
 {
-    // welp
+    if (!LAN::Init()) return false;
     return true;
 }
 
 void LAN_DeInit()
 {
-    //
+    LAN::DeInit();
 }
 
 int LAN_SendPacket(u8* data, int len)
 {
-    /*if (PCapAdapter == NULL)
-        return 0;
-
-    if (len > 2048)
-    {
-        printf("LAN_SendPacket: error: packet too long (%d)\n", len);
-        return 0;
-    }
-
-    pcap_sendpacket(PCapAdapter, data, len);
-    // TODO: check success
-    return len;*/
-    return len;
+    return LAN::SendPacket(data, len);
 }
 
-/*void LAN_RXCallback(u_char* blarg, const struct pcap_pkthdr* header, const u_char* data)
-{
-    while (PCapRXNum > 0);
-
-    if (header->len > 2048-64) return;
-
-    PCapPacketLen = header->len;
-    memcpy(PCapPacketBuffer, data, PCapPacketLen);
-    PCapRXNum = 1;
-}*/
-
 int LAN_RecvPacket(u8* data)
 {
-    /*if (PCapAdapter == NULL)
-        return 0;
-
-    int ret = 0;
-    if (PCapRXNum > 0)
-    {
-        memcpy(data, PCapPacketBuffer, PCapPacketLen);
-        ret = PCapPacketLen;
-        PCapRXNum = 0;
-    }
-
-    pcap_dispatch(PCapAdapter, 1, LAN_RXCallback, NULL);
-    return ret;*/
-    return 0;
+    return LAN::RecvPacket(data);
 }